Mr. Assange’s remarks in a June 12 interview underscored that for all the drama of the discord that the disclosures have sown among supporters of Bernie Sanders — and of the unproven speculation that the Russian government provided the hacked data to WikiLeaks in order to help Donald J. Trump — the disclosures are also the latest chapter in the long-running tale of Mr. Assange’s battles with the Obama administration.

In the interview, Mr. Assange told a British television host, Robert Peston of the ITV network, that his organization had obtained “emails related to Hillary Clinton which are pending publication,” which he pronounced “great.” He also suggested that he not only opposed her candidacy on policy grounds, but also saw her as a personal foe.

At one point, Mr. Peston said: “Plainly, what you are saying, what you are publishing, hurts Hillary Clinton. Would you prefer Trump to be president?”

Mr. Assange replied that what Mr. Trump would do as president was “completely unpredictable.” By contrast, he thought it was predictable that Mrs. Clinton would wield power in two ways he found problematic.